Given the following examples identify whether it describes a positive externality, negative externality, or neither.

Example 1: Johanna is graduating from college this weekend. Like her, individuals who earn a college degree are generally more productive and consequently earn higher wages.

Example 2: About 50% of the population of Madison have a college degree, which may help explain the city's lower overall crime levels.

Example 3: Due to higher inflation and increasing labor costs, universities and colleges across the United States have raised tuition paid by students, and thus affected more low income students.

Example 4: Because there are more people attending school, demand of teachers will increase.

Example 5: Because there are more people attending school due to the government's recent support towards higher education, Linda cannot find full time workers to help at her restaurant.